<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>优化节点添加</title>
</head>
<body>
  <script>
    for (let i = 0; i < 10; i++) {
      let p = document.createElement('p')
      p.innerHTML = i
      document.body.appendChild(p)
    }


    // 优化
    const fragEle = document.createDocumentFragment()
    for (let i = 0; i < 10; i++) {
      let p = document.createElement('p')
      p.innerHTML = i
      fragEle.appendChild(p)
    }
    document.body.appendChild(fragEle)
  </script>
</body>
</html>